Geneticists used to think that identical twins don't run in families, because the splitting of the fertilized egg happens randomly. While research has shown that most cases of identical twinning ...

Twins can show obvious differences in their physical appearance despite being offspring from the same pregnancy and one mom ...

In other words, a baby's tendency to cry might have more to do with their DNA than anything a parent does—or doesn't—do. "For parents, it may be a comfort to know that their child's crying is largely ...

Being funny and the appreciation of humor differs across people. Humor involves creating funny remarks, generated funny ideas, and eliciting laughter. Humor production does not seem to have a genetic ...

Fraternal or dizygotic twins develop from two different eggs fertilized by separate sperm; they generally share about 50 percent of their genes. Therefore, fraternal twins are essentially like ...

While identical twins are virtually genetic replicas of one another, fraternal twins like Jill and I share no more than 50-percent of their DNA.

A mum from Pennsylvania, in the US gave birth to twins and couldn't believe how different they looked four months later.

Identical twins reared apart offer pure estimates of genetic influence given that they share all their genes, but not their environments. Fraternal twins reared apart offer informative contrasts.

Identical twins share 100% of their genes, while fraternal twins only share about 50% of their genes, the same as any pair of siblings. A lot more research has been done on the genetics of food ...